Add latest post from current blog as content
Add config for list of links in nav
Add markup for outputing list of latest content on homepage
Add basic structure for layout

* Create a series of Sass partials to keep concerns separate
* Create a fluid central column between 2 fixed columns using display:
table and positioning
* Create the infinite flexible footer with pseudo elements
Add styles for nav items and show/hide nav functionality

* Use a hidden checkbox and linked label to set/unset the :checked
state of the input. Add a .site-container wrapper around everything and
shift it's left margin when the input is checked. With a bit of
transition applied, this has the effect of sliding the nav in and out.
Ensure spacing throughout layout is consistent

* Use $global-spacing variable to make sure everything (as far as is
sensibly possible) comes in multiples of 3em.
* Refactor the layout slightly to avoid main content area being too
wide. Will need to come up with a solution for mobile so that the size
of the nav sidebar doesn't reduce and the nav icon doesn't get hidden.